Technical Specications.
General
Battery power supply: 3V, two AA batteries
Operating Temperature: -4 to 94 F / -20 to 70 C
Storage Temperature: -31 to 167 F / -35 to 75 C
Cord Length: 150 cm
Weights: 20oz / 570g
Headphone
Type: Dynamic
Frequency Response: 50 Hz-20 kHz
Sensitivity: 95±5 dB SPL
Microphone and Amplier
Type: Noise-canceling Electret
Frequency Response: 100Hz to 5 kHz
Operating Voltage: 8-32 VDC
Matching Impedance: 150-1000 ohms
Sensitivity: -33±4 dB
Active Noise Reduction
Main Attenuation Frequency Band: 20Hz~650Hz
Power Consumption: 30 mW
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Good to know.